66701521711 has 8 divisors (see below), whose sum is σ = 74313494784. Its totient is φ = 59347581720.

The previous prime is 66701521613. The next prime is 66701521739. The reversal of 66701521711 is 11712510766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66701521711 - 2⁷ = 66701521583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66701521111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64507725 + ... + 64508758.

It is an arithmetic number, because the mean of its divisors is an integer number (9289186848).

Almost surely, 2^66701521711 is an apocalyptic number.

66701521711 is a deficient number, since it is larger than the sum of its proper divisors (7611973073).

66701521711 is a wasteful number, since it uses less digits than its factorization.

66701521711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129016541.

The product of its (nonzero) digits is 17640, while the sum is 37.

The spelling of 66701521711 in words is "sixty-six billion, seven hundred one million, five hundred twenty-one thousand, seven hundred eleven".